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dc.contributor.authorLaverick, Kiarn T
dc.contributor.authorChantasri, Areeya
dc.contributor.authorWiseman, Howard M
dc.date.accessioned2019-06-19T13:03:37Z
dc.date.available2019-06-19T13:03:37Z
dc.date.issued2019
dc.identifier.issn0031-9007
dc.identifier.doi10.1103/PhysRevLett.122.190402
dc.identifier.urihttp://hdl.handle.net/10072/385426
dc.description.abstractQuantum state smoothing is a technique for assigning a valid quantum state to a partially observed dynamical system, using measurement records both prior and posterior to an estimation time. We show that the technique is greatly simplified for linear Gaussian quantum systems, which have wide physical applicability. We derive a closed-form solution for the quantum smoothed state, which is more pure than the standard filtered state, while still being described by a physical quantum state, unlike other proposed quantum smoothing techniques. We apply the theory to an on-threshold optical parametric oscillator, exploring optimal conditions for purity recovery by smoothing. The role of quantum efficiency is elucidated, in both low and high efficiency limits.
dc.description.peerreviewedYes
dc.languageEnglish
dc.publisherAMER PHYSICAL SOC
dc.relation.ispartofpagefrom190402-1
dc.relation.ispartofpageto190402-6
dc.relation.ispartofissue19
dc.relation.ispartofjournalPHYSICAL REVIEW LETTERS
dc.relation.ispartofvolume122
dc.subject.fieldofresearchPhysical Sciences
dc.subject.fieldofresearchcode02
dc.titleQuantum State Smoothing for Linear Gaussian Systems
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.hasfulltextNo Full Text
gro.griffith.authorChantasri, Areeya
gro.griffith.authorLaverick, Kiarn T.
gro.griffith.authorWiseman, Howard M.


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